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Per, Ramon and Chuck - Thanks for the kind words! Much appreciated.I guess the ultimate solution to the backlash problem would be a real Aciera rotary table but even if they still exist I doubt I'd want to pay the asking. Even my lovely Aciera simple dividing head has a tiny amount of lost motion but it is probably well over 50 years old.As it is I'll follow Per's suggestion and measure the number of steps of lost motion and burn this into the firmware. Per's mention of G-code made me think that I might abandon the special purpose firmware and get Grbl working with just the A-axis.Thanks again - David